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[QUESTION] how is extracting subtitles from mkv or mp4 supported? #417

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opened 2026-01-29 16:43:32 +00:00 by claunia · 5 comments
claunia commented 2026-01-29 16:43:32 +00:00
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Originally created by @jakubvojacek on GitHub (Apr 13, 2018).

CCExtractor version: CCExtractor 0.87, Carlos Fernandez Sanz, Volker Quetschke

  • I have read and understood the contributors guide.
  • I have checked that the issue I'm posting isn't already reported.
  • I have checked that the issue I'm porting isn't already solved and no duplicates exist in closed issues and in opened issues
  • I have checked the pull requests tab for existing solutions/implementations to my issue/suggestion.
  • I have checked that the bug-fix I am reporting can be replicated, or that the feature I am suggesting isn't already present.
  • I have used the latest available version of CCExtractor to verify this issue exists.

My familiarity with the project is as follows (check one, eg [X] - and delete unchecked ones):

  • I have used CCExtractor just a couple of times.

Necessary information

  • Is this a regression (did it work before)? [x] NO | [ ] YES - please specify the last known working version
  • What platform did you use? [ ] Windows - [x] Linux - [ ] Mac
  • What were the used arguments? ccextractor -out=webvtt -nofc sample.mkv -o test.vtt

**Video links (replace text below with your links) **
Archive.zip

Additional information
Hello,

I am trying to extract subtitles from attached mkv sample. It should have czech and english subttiles available. According to what I've read, extracing subtitles from mkv should be availabe in the latest version. However it does not, it creates two files

Output file: sample_cze.(null)
Output file: sample_eng.(null)

which are 167 bytes big and have content

size: 720x576
palette: 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, e9ff78, 101010, 101010
forced subs: OFF

I tried convering the mkv into mp4 using ffmpeg however it still did not extract desired subtitles. Am I doing something wrong please? Or is it impossbile to get subtitles from this format?

Thank you
Jakub

Originally created by @jakubvojacek on GitHub (Apr 13, 2018). CCExtractor version: _CCExtractor 0.87, Carlos Fernandez Sanz, Volker Quetschke_ - [x] I have read and understood the [contributors guide](https://github.com/CCExtractor/ccextractor/blob/master/.github/CONTRIBUTING.md). - [x] I have checked that the issue I'm posting isn't already reported. - [x] I have checked that the issue I'm porting isn't already solved and no duplicates exist in [closed issues](https://github.com/CCExtractor/ccextractor/issues?q=is%3Aissue+is%3Aclosed) and in [opened issues](https://github.com/CCExtractor/ccextractor/issues) - [x] I have checked the pull requests tab for existing solutions/implementations to my issue/suggestion. - [x] I have checked that the bug-fix I am reporting can be replicated, or that the feature I am suggesting isn't already present. - [x] I have used the latest available version of CCExtractor to verify this issue exists. **My familiarity with the project is as follows (check one, eg [X] - and delete unchecked ones):** - [x] I have used CCExtractor just a couple of times. **Necessary information** - Is this a regression (did it work before)? [x] NO | [ ] YES - *please specify the last known working version* - What platform did you use? [ ] Windows - [x] Linux - [ ] Mac - What were the used arguments? `ccextractor -out=webvtt -nofc sample.mkv -o test.vtt` **Video links (replace text below with your links) ** [Archive.zip](https://github.com/CCExtractor/ccextractor/files/1907043/Archive.zip) **Additional information** Hello, I am trying to extract subtitles from attached mkv sample. It should have czech and english subttiles available. According to what I've read, extracing subtitles from mkv should be availabe in the latest version. However it does not, it creates two files ``` Output file: sample_cze.(null) Output file: sample_eng.(null) ``` which are 167 bytes big and have content ``` size: 720x576 palette: 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, 101010, e9ff78, 101010, 101010 forced subs: OFF ``` I tried convering the mkv into mp4 using ffmpeg however it still did not extract desired subtitles. Am I doing something wrong please? Or is it impossbile to get subtitles from this format? Thank you Jakub
claunia commented 2026-01-29 16:43:33 +00:00
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@thealphadollar commented on GitHub (Apr 16, 2018):

Hey @jakubvojacek, thanks for reporting.

I would like to request you to please provide the part of the video which has some subtitles being displayed as sample. The current sample displays no subtitles in VLC (too short and no sound part came) though it shows the presence of Czech and English subtitles.

@thealphadollar commented on GitHub (Apr 16, 2018): Hey @jakubvojacek, thanks for reporting. I would like to request you to **please provide the part of the video which has some subtitles** being displayed as sample. The current sample displays no subtitles in VLC (too short and no sound part came) though it shows the presence of Czech and English subtitles.
claunia commented 2026-01-29 16:43:34 +00:00
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@jakubvojacek commented on GitHub (Apr 16, 2018):

Hello @thealphadollar, please check https://motv.eu/sample.mkv

Thank you for support

@jakubvojacek commented on GitHub (Apr 16, 2018): Hello @thealphadollar, please check https://motv.eu/sample.mkv Thank you for support
claunia commented 2026-01-29 16:43:34 +00:00
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@thealphadollar commented on GitHub (May 6, 2018):

@cfsmp3 Any idea? I've been on this for few hours but I'm unable to step even a bit further. Something just seems out of place, the subtitles are in "spu" codec.

One weird thing though is that the subtitles and the audio are not in sync; any chance that it might be causing the problem? cc @jakubvojacek

@thealphadollar commented on GitHub (May 6, 2018): @cfsmp3 Any idea? I've been on this for few hours but I'm unable to step even a bit further. Something just seems out of place, the subtitles are in "spu" codec. One weird thing though is that the subtitles and the audio are not in sync; any chance that it might be causing the problem? cc @jakubvojacek
claunia commented 2026-01-29 16:43:34 +00:00
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@thealphadollar commented on GitHub (Sep 20, 2018):

@jakubvojacek Ping.

@thealphadollar commented on GitHub (Sep 20, 2018): @jakubvojacek Ping.
claunia commented 2026-01-29 16:43:34 +00:00
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@cfsmp3 commented on GitHub (Dec 23, 2018):

Closing since OP doesn't seem interested anymore.

@cfsmp3 commented on GitHub (Dec 23, 2018): Closing since OP doesn't seem interested anymore.
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